Egon's Pride has a high rate of fire. Perhaps there's a bug what makes it so the rapid fire weapon mod doesn't stop working, or maybe Egon's Pride just fires that fast at level 4.

Either way, adding mines wherever it hits results in painting with mines every surface your reticle graces. While handy at times, it means long waits for doors to become accessible, and... good heavens, you really end up having to watch where you step.